Carburetor



C. R. SNYDER CARBURETOR Filed April 2l, 1959 html Jan. 2l, 194:11.

Patented Jan. 21, 1941 UNITED STATES PATENT OFFICE 1 claim.

This invention relates to carburetors for use with internal combustionengines to gasify the liquid fuel used in the operation of said engines.The invention is particularly directed to a carburetor which willmechanically break up or reduce liquid fuel yinto finely divided-particles in order that it may be more readily and completely Vaporizedto secure more perfect combustion and a consequent conservation of fuel.A carburetor of this general type has been illustrated in my co-pendingapplication, Serial No. 119,437., led January 7', 1937, of which this.application is a continuation-impart.

The primary object of this invention resides in the provision of acarburetor having a casing in which a mixing chamber is formed, therebeing' an inlet for ,air to4 enter the mixing chamber and an outlet forthe carbureted fuel, the latter being adapted for connection to theintake manifold of 2Q an internal combustion engine, a rotary disk beingprovided in the mixing chamber to receive liquid fuel .and reduce it bycentrifugal force into a ne mist which will combine ywith air passingthrough the mixing chambers to produce an explosive mixture, an electricmotor being connected with said disk to cause its rotation at the speedmost conducive to a complete vaporization of the fuel.

By the provision of mechanical means for va- 3 porizing the liquid fuel,many of the parts of a conventional carburetorV may be eliminated,A

such as the float and its chamber, and improved engine performanceattained.

An outstanding example of an instance where a marked improvement will beshown is in aeroplane engine operation; with the proposed carburetor inwhich the fuel is fed directly to the carburetor under pump pressurethevengine will operate equally well in any position, even inverted,

for the carburetor does not depend upon the maintenance of a certainlevel of liquid or the flow of fuel by gravity to the-carburetor.

Other objects andadvantages will become apparent from the followingdescription of the sinl gle form of the invention disclosed in detail inthe accompanying drawing.

Fig. l is a vertical longitudinal sectional view taken through acarburetor formed in accordance with the present invention;

Fig. 2 is a horizontal sectional View taken through the mixing chamberof the carburetor on the plane indicated by the line II-II of Fig. l;

Fig. 3 is a similar view taken throughvthe outlet tube leading from themixing chamber on the plane indicated by the line III-III of Fig. 1.

Referring more particularly tol the drawing, the numeral I designatesthe carburetor in its entirety which is formed to include a casingcomposed of a pair of tubular inlet and outlet connections 2 and 3, eachheaving anenlarged flange 4 at one end. The flanges of the connections.are disposed in registration and are spaced by a cylindrical glass body5 which, together with the flanges, forms the mixing chamber of thecarburetor. ends of the glass cylinder and the flanges to preclude theescape of liquid fuel at these points. The outer peripheries ofl theflanges 4 are provided with ears through which bolts 'I pass to hold theflanges in engagement with the ends of the 1.55.

glass cylinder.` The outlet conduit is elbowshaped and has the endopposite that cn which the flange 4 is formedprovided with a smallerflange having openings 8 through which bolts extend to -secure thecarburetor to the intake 2 0 manifold of an engine. The horizontalportion of the connection 3 has a throttle valve 9 positicned thereinand secured to a transversely extending shaft I0, thebody of the shaftbeing squared to cause the, throttle valve to rotate 25 therewith.

The outer end of the shaft I0 is provided 'with an arm II which isconnected to the end of a rod I2 extending to the accelerator lpedal orother A carburetor controlling device. The outlet con- 3U nection isalso provided with an .axially disposed bearing I3 at the end on whichthe flange 4 is provided. The bearing I3 is supported by a web I4extending from the sides of the body 3. The outer wall on the outside ofthe elbow 3 is also formed with a bearing I5 in alignment with thebearing I3. A shaft I6 is rotatably supported by these bearings. Theoutside of the connection has a plurality of bosses formed thereon forthe' purpose of connecting an electric motor Il 40 thereto. The shaft I6may be a continuation of the armature shaft of the motor .as shown, orit may be a separate shaft coupled with the armature shaft. The upperinner end of the shaft IIS is threaded .as at I8 for connecting a smoothflat 45 disk I9 thereto. The disk extends parallel tothe flanges 4 androtates in a plane extending transversely of the glass cylinder.

When the motor receives electric current, the disk will be revolved atthe same rate of rotation 50 as the motor. The inlet connection 2 isalso elbow-shaped and has its outer wall provided with an opening inaxial alignment with the shaft I6. A fuel supply pipe 20 extends throughthe opening in the inlet connection and is secured 55 CAD Gasket yrings6 .are disposed between the 10l vco in position therein by lock nuts 2lthreaded on the tube and engaging the inner and outer surfaces of theboss. The lower end of the pipe 20 is threaded on its interior toreceive a nozzle 22 formed at its inner end with .a valve seat. A smallorifice extends from the valve seat to the outer end of the nozzle. Thenozzle is spaced a slight distance from the upper surface of the disk I9and is disposed in registration with the center of rotation of the disk.A needle valve 23 engages the valve seat on the nozzle and extendslongitudinally through the pipe 20 and has its reduced upper end 24extending through a T- fitting 25 secured to the upper end of the pipe.

A fuel supply line 26 is connected .with one branch of the T-fitting forsupplying fuel to the carburetor. The needle valve is resiliently heldin engagement with the nozzle seat by a coil spring 21 disposed betweenthe inner end of the T-tting and the shoulder produced by reducing thevalve stem. Where the reduced end of the valve stem extends beyond theconfines of the T-fitting, the latter is provided with a packing gland28 to prevent the escape of liquid fuel. In this instance, the fuel isfed to the carburetor under pressure to insure flow to the carburetorregardless of the position with respect to the horizontal.

To actuate the valve in opposition to the-spring 21, the outer end ofthe valve passes through a lever 29 pivoted as at 30 to a bracket 3lsecured to the inlet tting by the outer nut 2i A tension spring 32extends between the bracket 3| and the lever to resist movement to avalve opening position. The opposite end of the lever 29 is connected bya link 33 with a lever 34secured to an end of a shaft 35 extendingtransversely of the horizontal portion of the inlet connection.' Withinthe inlet connection, the shaft 35 is provided with a flapper valve 36which is engaged by air moving into the inlet connection and moved inproportion to the speed thereof. When the flapper valve is movedinwardly, the outer end of the arm 34 will move downwardly, drawing withit the link 33. As the upper end of the link is connected to the lever29, the latter will move with the link and the opposite end of the leverwill cause the needle valve to raise and move away from the seat in thenozzle, permitting the fuel to flow onto the disk I9. Due to therotation of the disk, the fuel will be broken upv and thrown bycentrifugal force against the inner surface of the cylinder 5. As theoutlet of the carburetor is connected to the intake manifold of theengine, the vacuum in the latter will be transmitted to the mixingchamber of the carburetor and airvwill be drawn through the inlet andmixed with the vaporized fuel thrown from the edge of the disk I9.

To cause the air passing through the mixing chamber to move downwardlyalong the inner walls of the cylinder, the anges 4 are provided withbosses 31 to the outer ends of which are secured bafe plates 38. Thebosses 31 serve to hold the baies spaced from the flanges 4 and providecircular passageways through which the air will move toward the innersurface of the cylinder. When the air reaches the inner surface of thecylinder, it will be guided downwardly until it engages the lower end ofthe mixing chamber. Then the air will move toward the center and theoutlet formed therein.

To provide for a flow of air for idling purposes,.

the shaft 35 also supports a second valve section 39 which isresiliently held in a closed position by a coil spring 40 which extendsfrom the valve plate 39 to a pivoted lever 4|. The tension of the spring40 is varied by moving the end of the lever 4I through the adjustment ofa set screw 42 extending through a boss formed on the connection 2. Thebracket 3| is also provided with a bell crank lever 43 which is operatedby a choke wire 44 to move the valve 23 to an open position when it isdesired to feed an increased amount of fuel to the disk I9. Thisoperation is performed when the motor is started in cooler weather.

To prevent injury to the carburetor in the event the motor backfires,the wall of the outlet connection is provided with a port 45. This portis normally closed by a disk 46 pivoted as at 41 to the outletconnection. The disk is held closed by a spring 48 which will permit theplate 46 to swing to an open position when the superatmospheric pressureoccurs in the carburetor. Ordinarily the pressure in the carburetor isslightly below atmospheric pressure due to the suction induced thereinby the motor and the plate 46 will tend to remain closed enabling a verylight spring 48 to be used.

From the foregoing, it will be apparent that a carburetor has beenprovided which will mevchanically break up liquid fuel into a ne mistwhich may be readily absorbed by air passing therethrough. lDue to thefact that the mechanism `for breaking up the liquid fuel is motordriven, a uniform vaporization will be secured as well as better motorperformance.

What is claimed is:

In a carburetor, a pair of elbow-shaped sections, each provided with aflange at one end, said flanges being arranged in opposed relationship,a sleeve-like element disposed between said flanges and cooperatingtherewith to form amixing chamber, a power driven shaft journaled in oneof said elbow-shaped sections and extending axially into said chamber, adisk-shaped vaporizing element secured for rotation with said shaft, atubular conductor carried by the second section and projecting into saidchamber, said conductor terminating adjacent said disk, a valve disposedfor longitudinal movement in said conductor, spring means for holdingsaid valve in a normally closed position, said valve being formed withan exteriorly projecting portion, a line for conveying liquid fuel underpressure to said conductor, air actuated means movably supported in saidsecond section, lever means pivotally supported by said second section,and means connecting said air actuated means and the exterior projectionof said valve to said lever whereby movement will be imparted to saidvalve in proportion to the movement of said air operated means.

CHARLES R. SNYDER.

